Severin Hacker is CTO & Founder at Duolingo, Inc. (DUOL). They have made 18 open-market trades across 1 company since 2021, most recently 2025-12-08.
CIK 0001870272
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
0 open-market purchases, against 18 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| DUOL | 50,072 | $7.1M |
Shares reported on the most recent Form 4, priced at the 2025-12-09 close.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| DUOL | SELL · 10b5-1 | 2025-11-19 | 2025-11-20 | $172.80 | $3.2M | +10.5% | +10.5% | -33.0% |
| DUOL | SELL · 10b5-1 | 2025-11-04 | 2025-11-06 | $263.15 | $5.2M | -8.1% | +8.9% | -38.8% |
| DUOL | SELL · 10b5-1 | 2025-10-20 | 2025-10-22 | $314.98 | $4.4M | -12.8% | -43.1% | -51.1% |
| DUOL | SELL · 10b5-1 | 2025-10-06 | 2025-10-07 | $320.88 | $5.3M | +0.8% | -39.7% | -42.4% |
| DUOL | SELL · 10b5-1 | 2025-09-19 | 2025-09-22 | $289.27 | $3.5M | +2.5% | +0.7% | -39.3% |
| DUOL | SELL · 10b5-1 | 2025-09-05 | 2025-09-09 | $268.58 | $4.2M | +6.1% | +23.0% | -24.1% |
| DUOL | SELL · 10b5-1 | 2025-08-19 | 2025-08-21 | $343.59 | $4.5M | -17.9% | -10.1% | -49.3% |
| DUOL | SELL · 10b5-1 | 2025-08-05 | 2025-08-07 | $343.93 | $6.2M | -15.8% | -32.9% | -35.7% |
| DUOL | SELL · 10b5-1 | 2025-07-21 | 2025-07-22 | $359.11 | $5.6M | -5.3% | -3.5% | -12.6% |
| DUOL | SELL · 10b5-1 | 2025-07-07 | 2025-07-09 | $392.78 | $5.7M | -8.9% | -5.2% | -18.1% |
| DUOL | SELL | 2025-06-20 | 2025-06-23 | $470.88 | $8.0M | -13.8% | -20.9% | -32.0% |
| DUOL | SELL · 10b5-1 | 2025-06-05 | 2025-06-09 | $524.60 | $7.3M | -5.6% | -21.8% | -45.7% |
| DUOL | SELL · 10b5-1 | 2025-05-19 | 2025-05-20 | $524.09 | $7.1M | +0.8% | -9.8% | -29.4% |
| DUOL | SELL · 10b5-1 | 2025-05-05 | 2025-05-07 | $496.22 | $8.1M | +3.0% | +1.6% | -32.6% |
| DUOL | SELL · 10b5-1 | 2025-04-21 | 2025-04-23 | $315.03 | $4.5M | +33.5% | +40.6% | -3.7% |
| DUOL | SELL · 10b5-1 | 2025-04-07 | 2025-04-09 | $292.21 | $4.6M | +3.8% | +58.2% | +20.2% |
| DUOL | SELL · 10b5-1 | 2025-03-19 | 2025-03-21 | $298.51 | $4.3M | +5.8% | -1.0% | +47.8% |
| DUOL | SELL · 10b5-1 | 2025-03-05 | 2025-03-06 | $290.81 | $3.3M | +6.4% | +9.2% | +91.1% |
| DUOL | SELL · 10b5-1 | 2025-02-19 | 2025-02-21 | $433.78 | $8.4M | -25.0% | -15.4% | +32.7% |
| DUOL | SELL · 10b5-1 | 2025-02-05 | 2025-02-06 | $391.14 | $7.5M | +9.6% | -29.8% | +25.5% |
| DUOL | SELL · 10b5-1 | 2025-01-21 | 2025-01-23 | $334.24 | $5.3M | +16.8% | +18.0% | +12.0% |
| DUOL | SELL · 10b5-1 | 2025-01-06 | 2025-01-07 | $336.33 | $5.5M | +5.9% | +22.3% | -6.9% |
| DUOL | SELL · 10b5-1 | 2024-12-19 | 2024-12-20 | $336.75 | $6.7M | -0.6% | -1.4% | -10.5% |
| DUOL | SELL · 10b5-1 | 2024-12-13 | 2024-12-16 | $338.59 | $28.6M | -5.4% | -9.2% | -16.5% |
| DUOL | SELL · 10b5-1 | 2024-12-12 | 2024-12-13 | $340.29 | $28.3M | +0.1% | -7.3% | -20.2% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.